[Comparative evaluation of the microstructure of combined samples made on the basis of acrylic plastic].

The Relevance Of The Study: Is dictated by the insufficient strength of the bases of removable plate prostheses made of acrylic plastic masses. The literature data confirm the high prevalence of strips of removable plate prostheses made of acrylic plastics, regardless of the complexity of the clinical situation, but in great dependence on the time of use of prostheses. The search for new approaches to reduce the risks of structural failures, regardless of the operating time, led to the emergence of a metal mesh and a composite frame.

The Purpose Of The Work: Is a comparative analysis of the resistance of structures to moisture and heat, in accordance with GOST R 57695-2017, aimed at modeling the aging of samples from acrylic polymers reinforced with a metal mesh and a composite frame based on fiberglass.

Materials And Methods: The whole experiment was carried out in accordance with GOST R 57695-2017 and was aimed at modeling the aging of three types of samples of acrylic polymers and combinations: «acrylic polymer-metal mesh», «acrylic polymer-composite frame» of size 20×18×1, 8 mm for studying microstructure and morphology. The obtained profiles of samples with a simulated aging effect were evaluated using an Axiovert 40MT optical microscope (Carl Zeiss), with an increase of ×200, ×500.

Results: Analysis of the microstructure data showed that profiles of 3 types of samples before exposure to aging factors have a homogeneous structure with a rough surface. With an increase of ×500 in four samples with a metal mesh, both before and after exposure to moisture and heat, the presence of voids between the base material and the metal reinforcing component is noted. In samples reinforced with composite material, its pronounced integration with acrylic plastic is preserved, which is due to the presence of a chemical bond. During the experiment, it was found that the conditions modeled according to GOST R 57695-2017 do not significantly affect the structure of the samples, and the morphology analysis revealed a close fit between the components of the materials in the combined samples and the absence of changes at the interface.

Conclusions: The proposed option of reinforcing the base of a removable laminar denture, due to the introduction of a skeleton made of composite material based on fiberglass, is optimal for increasing the effectiveness of orthopedic treatment.